The new and improved Provost III HMD. This HMD has been one of the most used world wide and is very effective. It is meant to fit the AOT Heads and any regular bowl as well. All you have to do is foil your bowl and this amazing HMD on top with some charcoal and it is ready to go. The New Provost III comes with two attachments that secure your Provost HMD to the bowl. 

Large adaptor size: 3.5 inches in diameter

Small adaptor size: 2.8 inches in diameter